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ABSTRACT

Inoculation with selected Rhizobium strains of common bean (Phaseolus vulgaris L.) contributes to the agricultural yield of this legume, improves soil fertility and reduces the use of nitrogen fertilizers in sustainable agricultural systems. The research aimed to determine the effect in field of the native strain Rhizobium leguminosarum bv. viciae COL6 on growth, N fixation and agricultural yield in common bean cv. Percal. A field trial was carried out to evaluate the parameters of nodulation, biomass, nitrogen fixation, yield components and agricultural yield in common bean. In addition, soil analyzes were performed before and after experimentation. Prior to planting an inoculant was formulated with the strain COL6. The seeds of cv. Percal were mixed in 250 g inoculant per 10 kg of seed and it was sown manually in the soil. The results of growth, N fixation (total N %) and agricultural yield demonstrated the positive effect of inoculation with the bacterial inoculant comparable with chemical fertilizers. The increase in agricultural yield with bacterial inoculant application and chemical fertilization with respect to control was 62 and 64 %, respectively. The results of the soil analysis were variable with respect to the initial physical-chemical characteristics. The promising results of bacterial inoculant use and the effective stimulation in common bean, open the doors for its potential use in Ecuadorian soils and with that the desired potential yield can be reached.